New York unearths paleotech relic [subway signal system].
On January 25, 2005, a fire knocked out a subway line serving large sections of Manhattan, Brooklyn, and Queens. The fire exposed a signal room containing some 600 electromechanical relays as well as signal wires, crucial components of a fixed-block signaling system that has kept proper headway betw...
| Xuất bản năm: | IEEE spectrum 42, 4(duplicate) (2005). |
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| Tác giả chính: | |
| Định dạng: | Bài viết |
| Ngôn ngữ: | English |
| Những chủ đề: |